Metadata Sample for 2014 Cedar River Watershed Delivery 1

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Quantum Spatial

Publication_Date: 20140411

Title: q47121g81be

Geospatial_Data_Presentation_Form: raster digital data

Description:

Abstract:

The bare earth digital elevation model (DEM) represents the earth's surface with all vegetation and human-made structures removed. It is derived from NIR LiDAR data using TIN processing of the ground point returns. Some elevation values have been interpolated across areas in the ground model where there is no elevation data (e.g. over water, under dense vegetation). Data was processed in reference to NAD83 (CORS96), however the horizontal datum for this dataset is defined as NAD83 (HARN) as the difference is generally small and allows for greater ease of use with data in different datums. The vertical datum is NAVD88, Geoid 03, and the data is projected in Washington State Plane North. Units are in US Survey Feet. Quantum Spatial collected the Cedar River Watershed Delivery 1 LiDAR data for the Puget Sound LiDAR Consortium between 12/11/13 and 02/06/14.

Purpose:

Provide high resolution terrain elevation data from the Cedar River Watershed Delivery 1 LiDAR dataset.

Supplemental_Information:

This data is assembled by 1/4th USGS Quadrangles and projected in Washington State Plane North.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20131211

Ending_Date: 20140206

Currentness_Reference: Cedar River Watershed Delivery 1 LiDAR

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -122.001419

East_Bounding_Coordinate: -121.936163

North_Bounding_Coordinate: 47.875626

South_Bounding_Coordinate: 47.812000

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword:

LiDAR, Light Detection and Ranging, high-resolution, elevation data, topography, bare earth, DEM, digital elevation model

Theme:

Theme_Keyword_Thesaurus: ISO 19115 Topic Categories

Theme_Keyword: elevation

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Washington

Place_Keyword: Snohomish County, King County

Access_Constraints: None

Use_Constraints:

In some areas of heavy vegetation or forest cover, there may be relatively few ground points in the LiDAR data. TINing the points produces large triangles and hence the elevations may be less accurate within such areas. Elevation values for open water surfaces should be considered approximate due to the increase of laser noise seen over water, frequent lack of returns, and the overall dynamic nature of water.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Puget Sound LiDAR Consortium

Contact_Person: Diana Martinez

Contact_Address:

Address_Type: mailing

Address: 1011 Western Ave, Suite 500

City: Seattle

State_or_Province: Washington

Postal_Code: 98104

Country: US

Contact_Voice_Telephone: 206-971-3052

Contact_Electronic_Mail_Address: dmartinez@psrc.org

Data_Set_Credit: Puget Sound LiDAR Consortium

Native_Data_Set_Environment:

Microsoft Windows 7 Version 6.1 (Build 7600) ; Esri ArcGIS 10.2.2.3552

Data_Quality_Information:

Logical_Consistency_Report:

Shaded relief images have been visually inspected for data errors such as pits, border artifacts, and shifting. LiDAR flight lines have been examined to ensure consistent elevation values across overlapping flight lines. The Root Mean Square Error (RMSE) of line to line relative accuracy for this dataset is 0.120 ft (0.037 m). Please see the LiDAR data report for a discussion of the statistics related to this dataset.

Completeness_Report:

LiDAR data has been collected and processed for all areas within the Delivery 1 area.

Positional_Accuracy:

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

The Root Mean Square Error (RMSE) of the vertical accuracy of this dataset is 0.085 ft (0.026 m). Please see the LiDAR data report for a discussion of the statistics related to this dataset.

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: 0.085 ft (0.026 m)

Vertical_Positional_Accuracy_Explanation:

Accuracy was assessed using 1363 ground survey RTK (real time kinematic) points.

Lineage:

Process_Step:

Process_Description:

Acquisition. Quantum Spatial collected the Cedar River Watershed Delivery 1 LiDAR data between 12/11/13 and 02/06/14. The survey used a Leica ALS60 laser system mounted in a Partenavia, and a Leica ALS70 laser system mounted in a Partenavia. Data was collected using a single pulse flight plan for the majority of the missions, and a multi pulse flight plan on 12/16/13. Near nadir scan angles were used to increase penetration of vegetation to ground surfaces. Ground level GPS and aircraft IMU were collected during the flight.
Leica ALS60 Instrument Parameters (12/11, 12/12): Beam diameter: 21 cm, Pulse rate: 95-106 kHz, Maximum returns: 4, Speed: 105 knots, Overlap: 63 %, Laser power: 16.7 %, Field of view (FOV): 26°, Beam wavelength: 1064 nm, Frequency of GPS sampling: 2 Hz, Frequency of IMU sampling: 200 Hz, Swath width: 416 m, AGL: 900 m, Average pulse density: 8.

Leica ALS60 Instrument Parameters (12/16): Beam diameter: 32 cm, Pulse rate: 152 kHz, Maximum returns: 4, Speed: 105 knots, Overlap: 63 %, Laser power: 58 %, Field of view (FOV): 24°, Beam wavelength: 1064 nm, Frequency of GPS sampling: 2 Hz, Frequency of IMU sampling: 200 Hz, Swath width: 595 m, AGL: 1400 m, Average pulse density: 8.

Leica ALS70 Instrument Parameters (2/3, 2/4): Beam diameter: 23 cm, Pulse rate: 265-275.6 kHz, Maximum returns: 7, Speed: 120 knots, Overlap: 63 %, Laser power: 49 %, Field of view (FOV): 30°, Beam wavelength: 1064 nm, Frequency of GPS sampling: 2 Hz, Frequency of IMU sampling: 200 Hz, Swath width: 536 m, AGL: 1000 m, Average pulse density: 8.

Leica ALS70 Instrument Parameters (2/5, 2/6): Beam diameter: 30 cm, Pulse rate: 201-209.4 kHz, Maximum returns: 7, Speed: 105 knots, Overlap: 63 %, Laser power: 63.8 %, Field of view (FOV): 30°, Beam wavelength: 1064 nm, Frequency of GPS sampling: 2 Hz, Frequency of IMU sampling: 200 Hz, Swath width: 697 m, AGL: 1300 m, Average pulse density: 8.

Process_Date: 20140206

Process_Step:

Process_Description:

1. Flight lines and data were reviewed to ensure complete coverage of the study area and positional accuracy of the laser points. 2. Resolve kinematic corrections for aircraft position data using kinematic aircraft GPS and static ground GPS data using Waypoint GPS 8.3, Trimble Business Center 3.10, and Geographic Calculator 2013. 3. Develop a smoothed best estimate of trajectory (SBET) file that blends post-processed aircraft position with attitude data using IPAS TC 3.1. Sensor head position and attitude are calculated throughout the survey. The SBET data are used extensively for laser point processing. 4. Calculate laser point position by associating SBET position to each laser point return time, scan angle, intensity, etc using ALS Post Processing Software 2.74. Create raw laser point cloud data for the entire survey in *.las (ASPRS v.1.2) format. Data are converted to orthometric elevations (NAVD88) by applying a Geoid03 correction. 5. Import raw laser points into manageable blocks (less than 500 MB) to perform manual relative accuracy calibration and filter erroneous points using TerraScan 14.001. Ground points are then classified for individual flight lines (to be used for relative accuracy testing and calibration). 6. Using ground classified points per each flight line, the relative accuracy is tested. Automated line-to-line calibrations are then performed for system attitude parameters (pitch, roll, heading), mirror flex (scale) and GPS/IMU drift using TerraMatch 14.001. Calibrations are calculated on ground classified points from paired flight lines and results are applied to all points in a flight line. Every flight line is used for relative accuracy calibration. 7. Classify resulting data to ground and other client designated ASPRS classifications using TerraScan 14.001 and TerraModeler 14.001. Assess statistical absolute accuracy via direct comparisons of ground classified points to ground RTK survey data. 8. Generate bare earth models as triangulated surfaces.

Process_Date: 20140411

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 7660

Column_Count: 5229

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet

Lambert_Conformal_Conic:

Standard_Parallel: 47.5

Standard_Parallel: 48.73333333333333

Longitude_of_Central_Meridian: -120.8333333333333

Latitude_of_Projection_Origin: 47.0

False_Easting: 1640416.666666667

False_Northing: 0.0

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000000026366619998441372

Ordinate_Resolution: 0.000000026366619998441372

Planar_Distance_Units: foot_us

Geodetic_Model:

Horizontal_Datum_Name: D North American 1983 HARN

Ellipsoid_Name: GRS 1980

Semi-major_Axis: 6378137.0

Denominator_of_Flattening_Ratio: 298.257222101

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Puget Sound LiDAR Consortium

Contact_Person: Diana Martinez

Contact_Address:

Address_Type: mailing

Address: 1011 Western Ave, Suite 500

City: Seattle

State_or_Province: Washington

Postal_Code: 98104

Country: US

Contact_Voice_Telephone: 206-971-3052

Contact_Electronic_Mail_Address: dmartinez@psrc.org

Distribution_Liability:

Please contact the Puget Sound LiDAR Consortium for information regarding the use of this data.

Metadata_Reference_Information:

Metadata_Date: 20140717

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Quantum Spatial

Contact_Address:

Address_Type: mailing and physical

Address: 517 SW 2nd St., Suite 400

City: Corvallis

State_or_Province: OR

Postal_Code: 97333

Country: US

Contact_Voice_Telephone: 541-752-1204

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time